Cups to gallons (gal) conversion factors are listed below (for US, UK and for both fluid and dry measurements). To find out how many gallons in cups, multiply by the conversion factor or use the converter if the conversion is from US cups to US fluid gallons.
1 Cup [US] = 0.0625 (1/16) Gallon [Fluid, US]
1 Cup [US] = 0.053710437 Gallon [Dry, US]
1 Cup [Metric] = 0.055 Gallon [UK]
There are 1/16 (0.0625) gallons in a cup, because from the smallest to the largest units from cup to gallon, a cup is a half (1/2) pint, a pint is a half (1/2) quart and finally a quart is a quarter (1/4) of a gallon, that makes 1/2 * 1/2 * 1/4 = 1/16 gallons in a cup.
For example, to calculate how many gallons of water or milk there are in 8 cups in US, multiply the cup value by the conversion factor, 8 cups * 1/16 (gal in 1 cup) = 1/2 (or half) gallons of water or milk in 8 cups.
Cup is a volume unit and used mostly to measure liquid and bulk, dry foods. There is no international standard for cups but mostly United States customary (236.5 ml) and metric cups (250 ml) are used. The imperial and the Canadian cups are not used any more. The abbreviation for cup is "c".
Gallon is an imperial and US customary volume unit. There is one type of gallon in imperial system and 2 types (liquid and dry) in US customary system. The imperial gallons are the largest in capacity (4.546 liters). The abbreviation for gallon is "gal".